**(h)**Lessee agrees, at its own cost and expense, to cause the Aircraft to be kept marked with the U.S. registration number specified above; and replace promptly any such Aircraft marking
which may be removed, defaced or destroyed. 

 **(i)**        If, and so long as,
no Event of Default exists under this Agreement, Lessee shall, and hereby is, authorized to assert and enforce, at Lessee’s sole cost and expense, in the name of and for the account of Lessor and/or Lessee, as their interests may appear,
whatever claims and rights Lessor may have under any warranties applicable to the Aircraft. 

 **(j)**Lessor may from time to time, at its option, perform any act which Lessee agrees hereunder to perform under this **Section 5** and which Lessee shall fail to perform after
being requested in 


  


5.